Portable door lock



FIG. 1 is a top elevational view of a portable door lock showing my new design;

FIG. 2 is a side elevational view showing the portable door lock of FIG. 1, the opposite side elevational view being a mirror image thereof;

FIG. 3 is a bottom elevational view of the portable door lock of FIG. 1;

FIG. 4 is a right end view thereof; and,

FIG. 5 is a left end view thereof. 

The ornamental design for a portable door lock, as shown and described. 